That. And the fact that doctor jokes have a well known scheme that's broken here, as you'd normally expect the joke to continue after the sentence.
A woman comes to the doctor and asks "Can I take a bath with my diarrhea?" The doctor answers: "Sure, if it's enough to fill the tub."
(Whipped cream) (Please note that I'm not a whipped cream supporter, I made this one for light theme users)